Sapphire normally make good AMD cards, so you should be fine
If I waited for reviews of the 7900 XT I have, I would still not have it. As there are none. Its worked for the last year.
it can depend on what the company sends out as review units. Powercolor, for instance, send out Hellhounds which are their middle range cards, making it hard to find reviews of other cards they make. Sapphire may have sent out Nitro+'s for testing as its their top model.
So just use card and see how you go
the Pulse is their reference model design, its the base model. It has same speed as a AMD Reference card. Chart at bottom shows all the cards -
https://www.techpowerup.com/gpu-specs/radeon-rx-7800-xt.c3839
not all speeds shown on the chart are correct, the speed for the Red Devil 7800xt is actually just a copy of the Hellhound, it is actually faster than they show. Techpowerup did same thing to my red Devil 7900xt. Seems a habit.